Selective Hydrogenation Catalyst of Ni-Mg/Al2O3 for FCC Light Gasoline

Abstract

A catalyst is provided for the selective hydrogenation of dienes from fluid catalytic cracking gasoline. There are a small quantity of dienes in fluid catalytic cracking gasoline which can deteriorate the quality of fluid catalytic cracking gasoline, as well as make its further process inconvenient. These dienes must be reduced as impurity. In this paper, the nickel supported on alumina selective hydrogenation catalysts modified with magnesium promoter are prepared by impregnation method. The fluid catalytic cracking gasoline (<75°C fraction) is observed and studied on the modified nickel on an alumina support catalysts. The results are that dienes are reduced by at least 80% to 90% and monoolefins reduced little. The modified catalyst shows better selectivity and stability. The optimal content of nickel and magnesium are 10%, 1.5% by weight of the support, respectively. The reaction operational conditions are also observed and studied. The optimal reaction temperature is 75°C, the liquid hours space velocity (LHSV) is 10 hr−1, the volume ratio of hydrogenation and oil (V H /V O ) is 10, and the reaction pressure is 1.5 MPa. The temperature of calcination is observed as well, and the optimal one is 1, 000°C